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Estes C11-3 model rocket engines are single-use black powder motors designed for compatible model rockets. The C-class designation indicates total impulse in the 5.01 to 10 Nm range, and the 3-second delay between burnout and ejection charge suits mid-altitude flights where a brief coast phase is needed before recovery deployment. Sold in a pack of two engines, the package also includes igniters and plugs needed for launch.